Diestock



l. w. NONNEMA N.

DIESTOCK.

APPLICATION FILED FEB. 91 I920.

2 SHEETS-SHEET 1.

momuzvs I. W. NONNEMAN,

DIESTOCK.

' APPLICATION Fl-LED ma. 9,1920.

Patented Jan. 31, 1922.

2 sums-sum 2.

INVENTOR 7 73 7 %M/(4Qa ATTORNEYS M W m. W. M w W J 35 k marized in the claims.

iaaw NQNNEMAN, or WABREM H O, ASSIGNOB mane Bonner commi s, T I

WARREN, OHIO, A CORPQRAFI'IQNDF OHIO.

iDI'LESTOGK.

Specification of Letters Extent.

' 7 Application filed February 9,1920. iSeriaI'NO. 357.235.

T it may concern:

it known th t I, W- O E A a citizen of the United States, residing at Warren, in the county of Trumbull and State of Ohio, have -;invented a certain new 7 ndusef lzlmp em nt in Die t s, of whichthe following isv ayfull, clear, and

. which carrying frame'a'long the pipe being threaded, and is more p'articularly concerned with that type of die'stocks in which a guiding frame is clamped to the pipe and has a threaded engagement with the chaser :car-r 'ryin-g frame to insure accurate advancement.

of the achasers along .the pipe, there being connections between the guide frame and the chaser carrying frame for causing the progressive recedence of the chasers.

The objects of the present invention include' the provision of a simple cheap construction. A more specific object is to pro- Vide for adjusting the chasers inwardly and outwardly with relation to the pipe to be threaded to accomplish accurate sizing of the threads to exact standard size while permitting cutting over and under-sized threads as desired. A preferred embodiment ofjmy invention is illustrated in the drawings in connection with which my inventi0n.is:hereinafter more fully explained, the essential characteristics thereof are sum- Fig. 1 is a'face or front view of the die stock; Fig. 2 is a side elevation of the same; Fig. 8 illustrates the camjplate for adjusting the-grippers of the guiding frame; Fig. 4 is a view similar. to Fig. 1 with the front projecting outwardly from opposite sides f he fr me ar sockets .5 preferably in.

ternally threaded to "receive ;the the stock handles .6.

The flanges -l and 2 are provided radial slots wadapted jwto receive chasers 1:0 34. fll h a flat face 11 adapted to rest against the plate :3 and having offset surfaces 12 and 131130 provide for receiving a yo'kemr bridge member 15. These yokes are shown asextending partially around the flange 3, and as leach {having legs extending over'two-of the chasers, abutting a'fshoulder' 1 4 between the surfaces 12 and 18, .and each yoke has its opposite ends resting against and in ,slidi;ng engagement with guide flanges 7 forming integral parts of 1the chaser carrying frame. Intermediate ofxthe legs OfthQfYOke is provided a boss .20. internallythreaded :to receive screws 21 projecte mg outwardly through theflange '1 into qpenings extending' through sockets-:5. Jam nuts 22 on the screws 21 may. 'lockthe yokes and screws together in any .positiongiven them .or may be relieved :to permit adjust.

merit whereby the chasersinay be caused to move inwardly or be permitted to recede any desired amount cornespondingto standard or oveiwor undersized threads. v

Projecting through the openings 8i-n the sockets 5 are cam fingers .30 against which the ends of the screws -21-may abut. Thesev cam fingers are shown as havingtheir inner surfaces ltapered outwardly, rearwan'dly of the die stock as shown at :31,";Figs.,2 and .8.

These fingersfiaire shown as rigidly PatentedJan. {31, 1922."

carried by radial projections on a ring 1 rotatably embracingan annular. groove formed-at the forward portionofthe guiding frame 40, whereby rotation of the ring and .cam fingers in vrelation to the guiding frame is permitted, but'the fingers and ring are prevented fromlongitudinal movement with re'lationwto'thisfframe and are thereby caused "to move through the chaser carrying frame. To cause this relativegmovement of the chaser carrying frame and guiding frame andfto insure the accurate progress 0f the chasers during the thread cutting operation, I have provided "master screw threads -*on' a rearwardly extending sleeve 42, preferably integral with "the chaser .car

rying frame and engaging internal threads at4i31on1wtheguiding frame- The screw threads have a pitch corresponding to the thread to be cut.

The guiding frame may be of any preferred construction. I have shown a construction-which has proven very practical and effective in use it is preferably in the nature of a sleeve, portions of which are cut away for lightness and which carries radial guides 45 for the clamping jaws 4L6. Rotatably embracing the frame is a cam plate 47 having a series of cam slots 48 adapted to engage pins 49 rigid with the jaws 426 and adapted to be turned to move the gripping jaws inwardly or outwardly. The periphery of the plate c7 may be knurled if desired ;or for convenience it may have an outwardly projecting wing 50 for rotating it with relation to the frame to actuate the gripping jawsto move them inwardly or outwardly with relation to the pipe to be threaded. When brought into pipe and the set'screw 52 tightened, the

chasers are now adjusted to cut a thread of the exact diameter desired by relieving the chasercarrying frame toward the guiding frame and thus along the'pipe, being threaded. This moves the pins 21 along the cam surfaces 31 permitting the guiding yokes 15 to move outwardly allowing the proper recedence of the chasers. The chasers are held in position-by arcuate plates 60 secured to the frame by screws'as at 61 which maybe removed whenever desired.

As these plates do not entirely cover the face of the frame, ready access is allowed to the screws 21 and lock nuts 22 for all ordinary use of the tool. It will be noted that the yokes 15 have the legs engaging the chasers'atright-angles thereto and the outward thrust of the chasers is received at three points, namely, the ends of the yokes bearing against the flanges .7 andv the screw 21 bearing against the cam fingers 30. It will also be noted that the off-set surfaces of the chasers are so arranged that the chasers may be removed by withdrawing 7 surfaces for adjusting the chasers inwardly or outwardly. I

2. In a die stock the combination of a rotary chaser carrying frame, stationary guiding frame. longitudinalfcam surfaces, a screw connecting said frames for causing such surfaces to havemovement relative to the chasers during the cutting'of the thread, screws abutting said cam surfaces and connected with the chasers for adjusting the chasers inwardly or 'outwardly.-

' 3. In a ,die stock thecombination of'a plurality of radially movable chasers, each'having a shoulder, bridge members each extend-" ing across a plurality of chasers and having shoulders engaging the shoulders on the to control the position of; the chasers, guidesfor the bridge members. I

4. Ina die stock, the combination of a chaser carrying frame bridge members'each rality of points to receive the-outward thrust chasers to resist outward radialmovement thereof, means for adjusting bridge members and extending across a plurality of chasers and having engagement with said frame at a pluof the chasers and an adjusting element on 7 each bridge member.

5. In a die stock the combination of a plurality of radially moving chasers, each hav-' ing a shoulder, bridge members each extending across a plurality ofchasers and'havlng shoulders engaging the shoulderson the] chasers to resist outward radiali'movement, means for ad usting bridge members to control the position of the chasers cams for-controlling the recession of said adjusting means. 7

6. In a die stock the combination of-a chaser carrying frame, radiallypositioned chasers therein, bridge members each con-: nected to a plurality of chasers and adapted to receive directly the radial thrust ofeach chaser engaged thereby, a screw engaging each bridge membeigtand cams having movement relative mum chaser carrying frame: against which said screws may bear to govern recession of: the chaser. I

7. In a chaser carrying frame the combination of a plurality of radially -.ymov-able chasers, yokes each. exti-indingv across atwo chasers and having :shouldersengaging the chasers to prevent outward radial movement;

a screw engagingthe yokes :intermediate'of the chasers, and projecting outwardly with relation to the frame, cam members having sloping surfaces, a guiding frame carrying said cam members permitting rotation but not longitudinal movement thereof and means for causing longitudinal movement of the chaser frame in relation. to the guiding frame. f i

8. In a chaser carrying frame the combination of a plurality of radially movable chasers, yokes each extending across two chasers and having shoulders engaging the chasers to preventoutward radial movement, a screw intermediate of the chasers, and projecting outwardly with relationto the frame, cam members having sloping surfaces to per? mit recession'of the chasers, and guides engaging the ends of the yokes and parallel to the screw. I j

9. In a die stockthe' combination of a chaser carrying frame, a plurality of chasers radially movable therein, bridge members each extending across two chasers, coacting shoulders on the bridge members and chasers resisting outward radial movement of the chasers, parallel abutting surfaces engaging and guiding the end of the bridge members, a screw carried by each of the bridge members parallel to said guiding surfaces, cam fingers approximately parallel to the axis of the thread'to be cut and governing the recession of the chasers by abutting the ends of said screws, and means for holding the cams against longitudinal movement while governing theadvance of the chasers as they cut.

10. In a die stock the combination of a chaser carrying frame, a plurality of chasers radlally movable therein, bridge members each extending across two chasers and resistchaser carrying frame, two chasers radially movable therein, a bridge member engaging said chasers, means rigid with the frame slidably engaging the bridge member at two points in the vicinity of the chasers respectively, and means for adjusting the position of the bridge member.

12. In a die: stock, the combination of a chaser-carrying frame, two chasers radially movable therein, a bridge member extending across and beyond the chasers, means rigid with the frame slidably engaging the ends of the bridge member on two parallel guiding surfaces, and an adjusting means con-1 nected with the brldge member between the chasers.

In testimony whereof, I hereunto afiix my signature.

YIRA' W. NQNNQEYMVAN. 

